Abstract
Micro/mini-channel heat sink is an effective cooling device for electronic components. To improve its comprehensive performance, several mini-channels with twisted ribs are designed and their hydraulic and thermal performances are investigated using numerical method under Reynolds number of 239–954. The results are compared with the mini-channels with plain ribs and with inclined ribs, and the effects of top twisted angle (0°–45°), bottom twisted angle (0°–45°) and height (0.5–1.0 mm) of twisted rib on performances are analyzed. Results show that twisted rib or inclined rib in mini-channel enhances heat transfer but also increases flow resistance compared to plain rib. Although the mini-channel with inclined ribs shows best thermal performance, the mini-channel with special twisted rib performs best comprehensive performance. Increasing top or bottom twisted angle or decreasing twisted rib height can improve thermal and comprehensive performances, as well as the flow resistance increases with the top or bottom twisted angle or twisted rib height increasing. The mini-channel with twisted rib with bottom twisted angle of 45°, top twisted angle of 0° and rib height of 0.5 mm yields the highest performance evaluation criterion among the mini-channels with ribs at the studied range of Reynolds number. The comparison of performance evaluation criterion between present study and several other studies suggests that, twisted rib structure has great potential to improve comprehensive performance of mini-channel at low Reynolds number.
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